Groove mount bowden adapter

This is a replacement for bowden groove adapter for standard e3d v6 and v5 extrudes. It mounts standard [PC4 M10 4mm pneumatic fitting](https://www.amazon.com/YOTINO-Straight-Pneumatic-Connector-Long-Distance/dp/B078SRBDS7/ref=sr_1_3). The PC4 fitting has better grip on the Teflon tube and prevents the extruders from pushing out of the mount. It also has no axial play the way the adapter that comes with the extruder does (or at least the one I got).